近距离煤层回采巷道布置合理位置研究

Research on optimum layout of mining roadway in close coal seams

以木瓜矿为工程背景,揭示了上覆煤层开采后煤柱下方围岩应力分布规律,研究表明,距离上覆区段煤柱垂直距离越小的区域,内部应力集中程度越高,集中范围越小。模拟了煤层间距为2 m和10 m条件下,上覆区段煤柱下回采巷道的合理位置。提出了回采巷道采用高预紧力锚杆配合单体支柱的超前支护方案,现场实践效果良好。

Taking Mugua Mine as engineering background,the stress distribution law of surrounding rocks under coal pillar after mining the overlying coal seam was revealed.The results showed that the closer the distance between the surrounding rocks and upper section pillar,the smaller the stress concentration range and the greater the inner stress concentration degree.The optimum layout of mining roadway under upper section pillar was determined by numerical simulation as the distance between two seams was 2 m and 10 m.The forepoling scheme of mining roadway was put forward which adopted high pretightening-force bolt and single prop,the field practice effects was well.